Copy release notes from release-19.0 into main

This commit was made automatically by the vitess-releaser tool.

See https://github.com/vitessio/vitess-releaser

Signed-off-by: Rohit Nayak <[email protected]>

changelog/19.0/19.0.8/changelog.md

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+# Changelog of Vitess v19.0.8
+
+### Bug fixes 
+#### Topology
+ * [release-19.0] Close zookeeper topo connection on disconnect (#17136) [#17191](https://github.com/vitessio/vitess/pull/17191) 
+#### VTTablet
+ * [release-19.0] Fix deadlock in messager and health streamer (#17230) [#17233](https://github.com/vitessio/vitess/pull/17233)
+ * [release-19.0] Fix potential deadlock in health streamer (#17261) [#17268](https://github.com/vitessio/vitess/pull/17268)
+### CI/Build 
+#### Build/CI
+ * [release-19.0] Specify Ubuntu 24.04 for all jobs (#17278) [#17280](https://github.com/vitessio/vitess/pull/17280) 
+#### Cluster management
+ * [release-19.0] Fix flakiness in `TestListenerShutdown` (#17024) [#17187](https://github.com/vitessio/vitess/pull/17187) 
+#### General
+ * [release-19.0] Upgrade the Golang version to `go1.22.9` [#17214](https://github.com/vitessio/vitess/pull/17214)
+### Enhancement 
+#### Query Serving
+ * [release-19.0] Fix to prevent stopping buffering prematurely (#17013) [#17203](https://github.com/vitessio/vitess/pull/17203)
+### Internal Cleanup 
+#### Build/CI
+ * [release-19.0] Change the name of the vitess-tester repository (#16917) [#17028](https://github.com/vitessio/vitess/pull/17028)
+### Release 
+#### General
+ * [release-19.0] Bump to `v19.0.8-SNAPSHOT` after the `v19.0.7` release [#17158](https://github.com/vitessio/vitess/pull/17158)
+ * [release-19.0] Code Freeze for `v19.0.8` [#17310](https://github.com/vitessio/vitess/pull/17310)
+### Testing 
+#### Build/CI
+ * [release-19.0] Flakes: Address flakiness in TestZkConnClosedOnDisconnect (#17194) [#17195](https://github.com/vitessio/vitess/pull/17195)
+

changelog/19.0/19.0.8/release_notes.md

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+# Release of Vitess v19.0.8
+The entire changelog for this release can be found [here](https://github.com/vitessio/vitess/blob/main/changelog/19.0/19.0.8/changelog.md).
+
+The release includes 11 merged Pull Requests.
+
+Thanks to all our contributors: @app/vitess-bot, @frouioui, @vitess-bot
+

changelog/19.0/README.md

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 ## v19.0
+* **[19.0.8](19.0.8)**
+	* [Changelog](19.0.8/changelog.md)
+	* [Release Notes](19.0.8/release_notes.md)
+
 * **[19.0.7](19.0.7)**
 	* [Changelog](19.0.7/changelog.md)
 	* [Release Notes](19.0.7/release_notes.md)